json-pod.h

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/* Simple Plugin API */
/* SPDX-FileCopyrightText: Copyright © 2022 Wim Taymans */
/* SPDX-License-Identifier: MIT */
 
#ifndef SPA_UTILS_JSON_POD_H
#define SPA_UTILS_JSON_POD_H
 
#ifdef __cplusplus
extern "C" {
#endif
 
#include <spa/utils/string.h>
#include <spa/utils/json.h>
#include <spa/pod/pod.h>
#include <spa/pod/builder.h>
#include <spa/debug/types.h>
 
static inline int spa_json_to_pod_part(struct spa_pod_builder *b, uint32_t flags, uint32_t id,
                const struct spa_type_info *info, struct spa_json *iter, const char *value, int len)
{
        const struct spa_type_info *ti;
        char key[256];
        struct spa_pod_frame f[1];
        struct spa_json it[1];
        int l, res;
        const char *v;
        uint32_t type;
 
        if (spa_json_is_object(value, len) && info != NULL) {
                if ((ti = spa_debug_type_find(NULL, info->parent)) == NULL)
                        return -EINVAL;
 
                spa_pod_builder_push_object(b, &f[0], info->parent, id);
 
                spa_json_enter(iter, &it[0]);
                while (spa_json_get_string(&it[0], key, sizeof(key)) > 0) {
                        const struct spa_type_info *pi;
                        if ((l = spa_json_next(&it[0], &v)) <= 0)
                                break;
                        if ((pi = spa_debug_type_find_short(ti->values, key)) != NULL)
                                type = pi->type;
                        else if (!spa_atou32(key, &type, 0))
                                continue;
                        spa_pod_builder_prop(b, type, 0);
                        if ((res = spa_json_to_pod_part(b, flags, id, pi, &it[0], v, l)) < 0)
                                return res;
                }
                spa_pod_builder_pop(b, &f[0]);
        }
        else if (spa_json_is_array(value, len)) {
                if (info == NULL || info->parent == SPA_TYPE_Struct) {
                        spa_pod_builder_push_struct(b, &f[0]);
                } else {
                        spa_pod_builder_push_array(b, &f[0]);
                        info = info->values;
                }
                spa_json_enter(iter, &it[0]);
                while ((l = spa_json_next(&it[0], &v)) > 0)
                        if ((res = spa_json_to_pod_part(b, flags, id, info, &it[0], v, l)) < 0)
                                return res;
                spa_pod_builder_pop(b, &f[0]);
        }
        else if (spa_json_is_float(value, len)) {
                float val = 0.0f;
                spa_json_parse_float(value, len, &val);
                switch (info ? info->parent : (uint32_t)SPA_TYPE_Struct) {
                case SPA_TYPE_Bool:
                        spa_pod_builder_bool(b, val >= 0.5f);
                        break;
                case SPA_TYPE_Id:
                        spa_pod_builder_id(b, (uint32_t)val);
                        break;
                case SPA_TYPE_Int:
                        spa_pod_builder_int(b, (int32_t)val);
                        break;
                case SPA_TYPE_Long:
                        spa_pod_builder_long(b, (int64_t)val);
                        break;
                case SPA_TYPE_Struct:
                        if (spa_json_is_int(value, len))
                                spa_pod_builder_int(b, (int32_t)val);
                        else
                                spa_pod_builder_float(b, val);
                        break;
                case SPA_TYPE_Float:
                        spa_pod_builder_float(b, val);
                        break;
                case SPA_TYPE_Double:
                        spa_pod_builder_double(b, val);
                        break;
                default:
                        spa_pod_builder_none(b);
                        break;
                }
        }
        else if (spa_json_is_bool(value, len)) {
                bool val = false;
                spa_json_parse_bool(value, len, &val);
                spa_pod_builder_bool(b, val);
        }
        else if (spa_json_is_null(value, len)) {
                spa_pod_builder_none(b);
        }
        else {
                char *val = (char*)alloca(len+1);
                spa_json_parse_stringn(value, len, val, len+1);
                switch (info ? info->parent : (uint32_t)SPA_TYPE_Struct) {
                case SPA_TYPE_Id:
                        if ((ti = spa_debug_type_find_short(info->values, val)) != NULL)
                                type = ti->type;
                        else if (!spa_atou32(val, &type, 0))
                                return -EINVAL;
                        spa_pod_builder_id(b, type);
                        break;
                case SPA_TYPE_Struct:
                case SPA_TYPE_String:
                        spa_pod_builder_string(b, val);
                        break;
                default:
                        spa_pod_builder_none(b);
                        break;
                }
        }
        return 0;
}
 
static inline int spa_json_to_pod(struct spa_pod_builder *b, uint32_t flags,
                const struct spa_type_info *info, const char *value, int len)
{
        struct spa_json iter;
        const char *val;
 
        spa_json_init(&iter, value, len);
        if ((len = spa_json_next(&iter, &val)) <= 0)
                return -EINVAL;
 
        return spa_json_to_pod_part(b, flags, info->type, info, &iter, val, len);
}
 
#ifdef __cplusplus
} /* extern "C" */
#endif
 
#endif /* SPA_UTILS_JSON_POD_H */